<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport"
	content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

<title>标题</title>

<script type="text/javascript" src="./js/jquery-3.3.1.min.js"></script>

<style type="text/css">
* {
	box-sizing: border-box;
}

.grandpa {
	background: gray;
	height: 200px;
	padding: 30px;
	width: 100%;
}
</style>
</head>

<body>
	<div class="grandpa"></div>
</body>
</html>

